<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="/node_modules/bootstrap/dist/css/bootstrap.css">
  <style>
    div {
      border: 1px solid red;
    }
    .ok {
      width: 80%;
    }
  </style>
</head>
<body>
  <div class="container">123123</div>
  <div class="container-sm">123123</div>
<div class="container-md ">123</div>
<div class="ok">1231</div>
</body>
</html>
